859
FNCA52 TJSJ 271930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST THU AUG 27 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-280800-
SOUTHEAST COASTAL PLAINS-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 10 0
TEMP (24H TREND) 76 (-3) 93 (0) 76 94
RH % (24H TREND) 86 (+3) 46 (-5) 90 52
WIND 20FT/EARLY(MPH) E 13 E 14 E 14 E 16
WIND 20FT/LATE(MPH) E 11 E 18 E 12 E 17
MIXING HGT(FT-AGL/MSL) 5700 4980
TRANSPORT WND (MPH) E 20 E 20
VENT RATE (KT-FT) 96900 84660
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-280800-
SOUTHERN HILLS-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 10 20
TEMP (24H TREND) 72 (-3) 91 (+3) 72 91
RH % (24H TREND) 95 (+6) 56 (-5) 98 52
WIND 20FT/EARLY(MPH) E 12 E 12 E 13 E 14
WIND 20FT/LATE(MPH) E 12 E 13 E 13 E 14
MIXING HGT(FT-AGL/MSL) 6600 5980
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 105600 95680
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-280800-
NORTH COASTAL PLAINS-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 40 20 50 20
TEMP (24H TREND) 75 (-3) 92 (+1) 75 93
RH % (24H TREND) 95 (+5) 59 (-6) 96 54
WIND 20FT/EARLY(MPH) E 14 E 16 E 17 E 14
WIND 20FT/LATE(MPH) E 13 E 19 E 12 E 20
MIXING HGT(FT-AGL/MSL) 5340 5470
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 85440 92990
DISPERSION 5 5
DSI 5 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-280800-
NORTHERN HILLS-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30 30
TEMP (24H TREND) 73 (-3) 90 (+1) 73 91
RH % (24H TREND) 97 (+3) 61 (-6) 97 52
WIND 20FT/EARLY(MPH) E 13 E 13 E 14 E 13
WIND 20FT/LATE(MPH) E 11 E 16 E 8 E 18
MIXING HGT(FT-AGL/MSL) 6570 6630
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 91980 86190
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-280800-
WEST COAST-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 20 30 40
TEMP (24H TREND) 73 (-3) 94 (+1) 74 94
RH % (24H TREND) 97 (+4) 59 (-5) 96 42
WIND 20FT/EARLY(MPH) E 16 E 12 E 13 E 16
WIND 20FT/LATE(MPH) E 13 E 13 E 9 E 16
MIXING HGT(FT-AGL/MSL) 5170 5010
TRANSPORT WND (MPH) E 12 E 12
VENT RATE (KT-FT) 51700 50100
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-280800-
EASTERN INTERIOR-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 40 20 60 20
TEMP (24H TREND) 74 (-3) 92 (+2) 74 92
RH % (24H TREND) 95 (+5) 57 (-4) 98 56
WIND 20FT/EARLY(MPH) E 13 E 13 E 13 E 14
WIND 20FT/LATE(MPH) E 13 E 14 E 16 E 14
MIXING HGT(FT-AGL/MSL) 7030 6230
TRANSPORT WND (MPH) E 16 E 18
VENT RATE (KT-FT) 98420 99680
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-280800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 40 20 60 30
TEMP (24H TREND) 71 (-3) 87 (+3) 71 88
RH % (24H TREND) 99 (+4) 63 (-6) 100 64
WIND 20FT/EARLY(MPH) E 11 E 12 E 11 E 13
WIND 20FT/LATE(MPH) E 10 E 13 E 12 E 13
MIXING HGT(FT-AGL/MSL) 4240 4240
TRANSPORT WND (MPH) E 16 E 18
VENT RATE (KT-FT) 59360 67840
DISPERSION 5 5
DSI 5 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-280800-
CENTRAL MOUNTAIN RANGE-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 20 20 40
TEMP (24H TREND) 69 (-4) 89 (+4) 69 89
RH % (24H TREND) 98 (+4) 64 (-7) 98 54
WIND 20FT/EARLY(MPH) E 11 E 9 E 8 E 11
WIND 20FT/LATE(MPH) E 10 E 10 E 6 E 11
MIXING HGT(FT-AGL/MSL) 8210 7800
TRANSPORT WND (MPH) E 13 E 14
VENT RATE (KT-FT) 90310 93600
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-280800-
CAYEY MOUNTAIN RANGE-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 40 20 60 0
TEMP (24H TREND) 72 (-2) 87 (+1) 71 88
RH % (24H TREND) 97 (+3) 62 (-1) 100 62
WIND 20FT/EARLY(MPH) E 11 E 11 E 11 E 12
WIND 20FT/LATE(MPH) E 10 E 12 E 11 E 12
MIXING HGT(FT-AGL/MSL) 5710 5210
TRANSPORT WND (MPH) E 17 E 20
VENT RATE (KT-FT) 85650 88570
DISPERSION 5 5
DSI 3 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-280800-
VIEQUES-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS TSTMS SHOWERS
CHANCE PRECIP (%) 30 20 50 10
TEMP (24H TREND) 79 (-2) 91 (+1) 80 91
RH % (24H TREND) 82 (+2) 56 (-4) 86 58
WIND 20FT/EARLY(MPH) E 17 E 16 E 18 E 18
WIND 20FT/LATE(MPH) E 17 E 17 E 19 E 16
MIXING HGT(FT-AGL/MSL) 3490 3210
TRANSPORT WND (MPH) E 20 E 20
VENT RATE (KT-FT) 59330 54570
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-280800-
CULEBRA-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 20 40 20
TEMP (24H TREND) 80 (-2) 92 (+2) 80 92
RH % (24H TREND) 87 (+5) 58 (-7) 90 59
WIND 20FT/EARLY(MPH) E 17 E 16 E 18 E 18
WIND 20FT/LATE(MPH) E 17 E 17 E 19 E 16
MIXING HGT(FT-AGL/MSL) 3380 3330
TRANSPORT WND (MPH) E 21 E 24
VENT RATE (KT-FT) 60840 69930
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-280800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 10 10
TEMP (24H TREND) 75 (-3) 94 (+2) 76 94
RH % (24H TREND) 89 (+3) 48 (-6) 85 45
WIND 20FT/EARLY(MPH) E 11 E 17 E 18 E 21
WIND 20FT/LATE(MPH) E 11 SE 19 E 13 SE 21 G29
MIXING HGT(FT-AGL/MSL) 5760 5190
TRANSPORT WND (MPH) E 18 E 23
VENT RATE (KT-FT) 92160 103800
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-280800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 40 20
TEMP (24H TREND) 79 (-2) 90 (+3) 79 90
RH % (24H TREND) 88 (+5) 60 (-5) 90 61
WIND 20FT/EARLY(MPH) E 17 E 17 E 18 E 19
WIND 20FT/LATE(MPH) E 17 E 17 E 19 E 16
MIXING HGT(FT-AGL/MSL) 3310 3290
TRANSPORT WND (MPH) E 21 E 23
VENT RATE (KT-FT) 59580 65800
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-280800-
ST CROIX-
330 PM AST THU AUG 27 2026
TONIGHT FRI FRI NIGHT SAT
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20 20
TEMP (24H TREND) 79 (-2) 91 (+2) 79 91
RH % (24H TREND) 86 (+2) 61 (-4) 89 60
WIND 20FT/EARLY(MPH) E 16 E 16 E 17 E 18
WIND 20FT/LATE(MPH) E 16 E 16 E 18 E 16
MIXING HGT(FT-AGL/MSL) 4240 4750
TRANSPORT WND (MPH) E 20 E 22
VENT RATE (KT-FT) 72080 90250
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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